<template>
  <div class="login_container">
    <div class="login_box">
      <!--头像区域-->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="logo">
      </div>
      <!--登录表单区域-->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" class="login_form" label-width="0px">
        <!--用户名-->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" placeholder="请输入用户名" prefix-icon="el-icon-user"></el-input>
        </el-form-item>
        <!--密码-->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" placeholder="请输入密码" prefix-icon="iconfont iconmima"
                    type="password">
          </el-input>
        </el-form-item>
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginform">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
  export default {
    name: 'Login',
    data () {
      return {
        loginForm: {
          username: 'admin',
          password: '123456',
        },
        //这是表单的验证规则对象
        loginFormRules: {
          //验证用户名是否合法
          username: [
            { required: true, message: '请输入登录名称', trigger: 'blur' },
            { min: 3, max: 10, message: '长度在3到10个字符', trigger: 'blur' }
          ],
          //验证密码是否合法
          password: [
            { required: true, message: '请输入密码', trigger: 'blur' },
          ]
        }
      }
    },
    methods: {
      login () {
        this.$refs.loginFormRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$axios.post('/api/login', this.loginForm)
          if (res.meta.status !== 200) return this.$message.error('登录失败！')
          this.$message.success('登录成功')
          // 1. 将登录成功之后的 token，保存到客户端的 sessionStorage 中
          //   1.1 项目中出了登录之外的其他API接口，必须在登录之后才能访问
          //   1.2 token 只应在当前网站打开期间生效，所以将 token 保存在 sessionStorage 中
          window.sessionStorage.setItem('token', res.data.token)
          // 2. 通过编程式导航跳转到后台主页，路由地址是 /home
          this.$router.push('/home')
          })
      },
      //点击重置
      resetLoginform () {
        this.$refs.loginFormRef.resetFields()
      }
    }
  }
</script>

<style lang="less" scoped>
  .login_container {
    height: 100%;
    background: url("../assets/img/bg.png") no-repeat;
    background-size: 100% 100%;
  }

  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border: 1px solid rgba(229, 229, 229, 1);
    box-shadow: -7px 7px 8px 0px rgba(0, 0, 0, 0.2);
    border-radius: 5px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box {
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;

      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }

    .login_form {
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 0 20px;
      box-sizing: border-box;
    }

    .btns {
      display: flex;
      float: right;
    }
  }
</style>
